第一题

#include<stdio.h>
struct student{
    int num;
    char name[10];
    int score;

};
int main(void)
{
    int sum;
    double average;
    int i,index,j;
    struct student students[10],temp;

    for(i=0;i<10;i++)
    {
        scanf("%d",&students[i].num);
        scanf("%s",students[i].name);
        scanf("%d",&students[i].score);
    }
    for(i=1;i<=10;i++)
    {
        sum=sum+students[i].score;
        average=sum/10;
    }

        for(i=0;i<10-1;i++)
        {
            index=i;
            for(j=i+1;j<10;j++)
                if(students[j].score>students[index].score)
                    index=j;
                temp=students[index];
                students[index]=students[i];
                students[i]=temp;
        }
        printf("num name average\n");

        for(i=0;i<10;i++)
            printf("The student score:\n");
        scanf("%d %s %.2lf\n",students[i].num,students[i].name,students[i].score);
        
   
    return 0;
}